Well tool



@attended Apr.. l 192@ ALBERT SIDNEY RDDLE, 0F CEICKAS @KL 1203EA y WELL TOGL.

' applicati@ mea my es, 1922. serial ivo. 578,094.

To all whom t may concern: Be 1t known that l, vALBER'L S. RIDDLE, a

citizen of the United States, and resident of Ch1ckasha,in the county of Grady and State of Oklahoma, have invented certain new andl useful improvements in Well Tools, of which the following is a specication.

This invention relates to drills especially adapted for use in connection with the rotary drilling of wells, y

Briefly stated, an important object of this invention is to provide a drilling tool comprising al body which is tapered throughout its length and is provided on lits periphery with a plurality of detachable lugs, all of which cooperate to remove thin layers of niaterial from the wall of the well thereby allowing a drill to rotate rapidly.

A further object is to provide a rotary drilling tool having simple means whereby the lugs may be readily detached so as to allow the same to be replaced or resharpened.

A further object is to provide a rotary drilling tool which is of highly simplified construction, simple to operate and cheap to manufacture.

@ther objects and advantages of the in vention will be apparent during the course of the following description.

= ln the accompanying drawings, forming a part of thisy application, and in. which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of the'improved drill in use,

Figure 2 is a horizontal sectional view taken on line 2 2 of 'Figure l,

Figure 3 is a perspective of the body of the improved drill, p Figure d is a perspective of one of the lugs or blades embodied in the invention,

Figure 5 is a perspective ofthe blade illustrating the opposite side of the same.

ln the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral. 5 genorally designatese cone-shaped body the forward end of which is provided with a threaded socket 6 for the reception of the attaching portion of a cuttin disk 7 of any usual or .well known type. n carrying out the invention, `the rear portion of the coneshaped body' is provided with an attaching I, stem 8 which is threaded into the; rotary drill stem 9 and as is well known the rotation and descent of the drill stem 9 will cause the cone-shaped body 5 and the disk 7 to come in coract with the wall and bottom of the we i rlhe cone-shaped body 5 is provided with a plurality of diagonally extending cutting lugs 9 which are presented to the wall of the well so as to enlarge the same. That is to say vthe cutter 7 forms the hole and the cutting lugs 9 follow the lugs 7 so as to ream' or enlarge the hole and by reason of presenting a plurality of lugs to the wall of the well the body 5 may be rotated at a high rate of speedv and a more eicient cut may be made.

As illustrated in Figures 2 and 3 the body 5 whi/ch is gradually and uniformly in creased in diameter toward its rear end is provided with a plurality of diagonally eX- tending grooves l0 the walls of which are 'undercut'so that when vthe base portions 1l of the cutting lugs are introduced into the grooves they will be securely held in position. Figure 3 illustrates that the rear end wall of the groove 11 is undercut as indicated at 14 for engagement by the extended end 15 of the base 11. By reason of this construction,y the base portion 11 of the lug is securely/ and positively held in position. When the lug is connected to the body, it may be held in position and against dis placement by means of a fastening device 16 threaded in the body and having a `head located. within a recess in the forward end of the lug.

The lcutting lug 9 has its'outer portion provided with a beveled side-18 which constitutes a cutting edge adapted for engagement with the wall of the well so as to enlarge the hole formed by the cutting bits 7.

1ln operation, the lugs are engaged with the wall of the well at various places and take' oil thin layers of material so as to reduce fthe strain and oi'er less resistance. By thus reducing the resistance offered a much higher rotary speed of the tooly vis attained.

lh the practice of the invention, the lugs 9 may be readily and conveniently removed by detaching the fastening devices 16 and a new set of iugsimay be inserted or the old lugs sharpened.

siiifith reference to the foregoing description taken in connection with the accompanying drawings, it' will be apparent that the improved drill will effectively drill the hole with a. high degree of eicienoy and in a highly expeditious manner.

Having thus described 'the invention, what is claimed is z- A Well drilling 'bit comprising :i gradually tapered body having diagonal grooves graduallyincreasing in dept-h oward their rear ends and having their side and rear walls undercut, and e plurality of separate lugs having base portions provided with outifieeee rear end Walls of said grooves, said separate lugs being located at spaced poinis along' and about the tapered body to cui thin layers of material from the Wall of the hole being drilled.

ALBERT SlDNEY RDDLE. 

